判断题

电磁阀线圈上的两个连线无极性要求，220v的活性和零线可以对调。（）

答案：正确

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单项选择题

2．下列属于生物学安全防护的是

A．科学处理废弃物
B．正确使用离心机
C．妥善保管有毒物品
D．进入BL-2

单项选择题

4.8 4 According to Plato and Socrates, philosophy is _____.

A． A. something to be practised by retreating from society to a life of personal meditation
B． B. an active engagement with the real world, making due contribution to the common good of the whole city